Does anyone think Delta will start offering the ability to book mileage upgrades on Delta.com anytime soon? Northwest had this feature availability before they were taken over...Delta still doesn't offer it some 3 or more years later! Thanks!

Delta.com says they will add the feature and a miles and money feature (old Perkchoice on NW) but give no indication when this might be. I used both those features on nwa.com and i can't figure out why it should take DL so long to implement.